So many people these days say that Shellac ruins their nails, but when it is applied correctly and removed correctly, there will be no damage to your natural nails ? I genuinely believe that, I know it! So lets discuss why people think it’s damaging! First of all, I’ll be mentioning both Shellac and Gelish, because they are the 2 brands that I use and work with. The Difference between Shellac & Gelish: Shellac .